Honeywell RTH7400 series Quick Start Manual page 14

Wiring Notes
Conventional system
Alternate wiring (conventional systems)
Remove metal jumper connecting
only if you must connect both
If your old thermostat had both
remove metal jumper. Connect the
terminal, and the
Rc
If your old thermostat had only 1
wire, connect it to the
thermostat had 2 or
C
separately with electrical tape and do not
connect them.
Heat pump
Connect wires: Heat Pump
1. Match each labeled wire with same letter on new thermostat.
2. Use a screwdriver to loosen screws, insert wires into hole under
screw, then tighten screws until wire is secure.
3. If E and Aux do not each have a wire connected, use a small
piece of wire to connect them to each other.
4. Push any excess wire back into the wall opening.
Labels don't match?
If labels do not match letters on thermostat, see Alternate
wiring (heat pump system only)
Alternate wiring (heat pump system only)
Leave metal jumper in place, connecting
If your old thermostat had both
contact a qualified contractor for help.
If your old thermostat had separate
wire to the terminal. If another wire is attached to the
B C
terminal, stop now and contact a qualified contractor for help.
If your old thermostat had
contact a qualified contractor for help.
If terminal is used,
L
5
(contact a contractor if there is no
If and terminals do not each have a wire connected, use
E Aux
6
a small piece of wire to connect them to each other.
and
R Rc
and wires.
R Rc
and wires,
R RH
wire to the
R
wire to the terminal.
RH R
or
C C1
terminal. If your old
C
wires, wrap each
C1
&
R Rc
and wires, stop now and
V VR
and wires, attach the
O B
, and wires, stop now and
Y1 W1 W2
terminal wire must be connected
C
wire).
C
C
G
Y
W
RC
R
W2
Y2
HEAT PUMP
C
G
Y
O/B
RC
R
3
terminals.
C
4
14
C
3
G
Y
W
Rc
2
R
2
W2
Y2
MCR32160
HEAT PUMP
Aux
E
L
MCR33552
C
5
G
Y
O/B
3
RC
R
2
AUX
6
E
6
L
5
MCR32161